Storage unit



FIG. 1 is a top, front, left perspective photographic view of a storage unit showing my new design;

FIG. 2 is a front photographic view thereof;

FIG. 3 is a left photographic view thereof;

FIG. 4 is a right photographic view thereof; and,

FIG. 5 is a top photographic view thereof.

The broken lines depicting the remainder of the storage unit show features that form no part of the claimed design. 

CLAIM The ornamental design for a storage unit, as shown and described. 